Image processing Feature extraction

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1 image processing

1.1 low-level

1.1.1 curvature
1.1.2 image motion


1.2 shape based
1.3 flexible methods





image processing

one important area of application image processing, in algorithms used detect , isolate various desired portions or shapes (features) of digitized image or video stream. particularly important in area of optical character recognition.


low-level

edge detection
corner detection
blob detection
ridge detection
scale-invariant feature transform

curvature

edge direction, changing intensity, autocorrelation.

image motion

motion detection. area based, differential approach. optical flow.

shape based

thresholding
blob extraction
template matching
hough transform

lines
circles/ellipses
arbitrary shapes (generalized hough transform)
works parameterizable feature (class variables, cluster detection, etc..)



flexible methods

deformable, parameterized shapes
active contours (snakes)






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